/*
 * Copyright (c) 2004, 2005, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
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 */

// DefaultHandler2.java - extended DefaultHandler
// http://www.saxproject.org
// Public Domain: no warranty.
// $Id: DefaultHandler2.java,v 1.2 2004/11/03 22:49:08 jsuttor Exp $

package org.xml.sax.ext;

import java.io.IOException;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;


/**
 * This class extends the SAX2 base handler class to support the
 * SAX2 {@link LexicalHandler}, {@link DeclHandler}, and
 * {@link EntityResolver2} extensions.  Except for overriding the
 * original SAX1 {@link DefaultHandler#resolveEntity resolveEntity()}
 * method the added handler methods just return.  Subclassers may
 * override everything on a method-by-method basis.
 *
 * <blockquote>
 * <em>This module, both source code and documentation, is in the
 * Public Domain, and comes with <strong>NO WARRANTY</strong>.</em>
 * </blockquote>
 *
 * <p> <em>Note:</em> this class might yet learn that the
 * <em>ContentHandler.setDocumentLocator()</em> call might be passed a
 * {@link Locator2} object, and that the
 * <em>ContentHandler.startElement()</em> call might be passed a
 * {@link Attributes2} object.
 *
 * @author David Brownell
 * @since SAX 2.0 (extensions 1.1 alpha)
 */
public class DefaultHandler2 extends DefaultHandler
    implements LexicalHandler, DeclHandler, EntityResolver2 {

  /**
   * Constructs a handler which ignores all parsing events.
   */
  public DefaultHandler2() {
  }

  // SAX2 ext-1.0 LexicalHandler

  public void startCDATA()
      throws SAXException {
  }

  public void endCDATA()
      throws SAXException {
  }

  public void startDTD(String name, String publicId, String systemId)
      throws SAXException {
  }

  public void endDTD()
      throws SAXException {
  }

  public void startEntity(String name)
      throws SAXException {
  }

  public void endEntity(String name)
      throws SAXException {
  }

  public void comment(char ch[], int start, int length)
      throws SAXException {
  }

  // SAX2 ext-1.0 DeclHandler

  public void attributeDecl(String eName, String aName,
      String type, String mode, String value)
      throws SAXException {
  }

  public void elementDecl(String name, String model)
      throws SAXException {
  }

  public void externalEntityDecl(String name,
      String publicId, String systemId)
      throws SAXException {
  }

  public void internalEntityDecl(String name, String value)
      throws SAXException {
  }

  // SAX2 ext-1.1 EntityResolver2

  /**
   * Tells the parser that if no external subset has been declared
   * in the document text, none should be used.
   */
  public InputSource getExternalSubset(String name, String baseURI)
      throws SAXException, IOException {
    return null;
  }

  /**
   * Tells the parser to resolve the systemId against the baseURI
   * and read the entity text from that resulting absolute URI.
   * Note that because the older
   * {@link DefaultHandler#resolveEntity DefaultHandler.resolveEntity()},
   * method is overridden to call this one, this method may sometimes
   * be invoked with null <em>name</em> and <em>baseURI</em>, and
   * with the <em>systemId</em> already absolutized.
   */
  public InputSource resolveEntity(String name, String publicId,
      String baseURI, String systemId)
      throws SAXException, IOException {
    return null;
  }

  // SAX1 EntityResolver

  /**
   * Invokes
   * {@link EntityResolver2#resolveEntity EntityResolver2.resolveEntity()}
   * with null entity name and base URI.
   * You only need to override that method to use this class.
   */
  public InputSource resolveEntity(String publicId, String systemId)
      throws SAXException, IOException {
    return resolveEntity(null, publicId, null, systemId);
  }
}
